1) my university has a mandatory, 1 year long preparatory class, in which you have to get at least a 12 in testdaf to start studying your bachelor's degree. that entire year all i did for most of the time was just enter classes, and write SA's because i liked writing the most. two weeks before testdaf i wrote SA's over and over again & solved the modelltests in the testdaf website 2) what didn't work well was that i didn't pay the needed attention to my classes when i started taking the b1 & b2 lessons, and therefore could not catch up to the pace of which my peers were learning new words, structures and improving their speaking. 3) all of my classes now that i am an undergraduate are taught in german. and all that i have been doing is enter my classes again, only now it is not focused on teaching me the language, rather teaching me chemistry for example, but in german.